Air pump for pressure fuel tanks



May 19, 1931.

L. s. CHADWICK ,805,757

AIR PUMP FOR PRESSURE FUEL TANKS Filed Jan. 13. 1927 3 Sheets-Sheet l 5&1, 4%, M wkm al bi/neg y 19.31. L. s. CHADWICK 1,805,757

' AIR PUMP FOR PRESSURE FUEL TANKS Filed Jan. 13. 1927 3 Sheets-Sheet 2 v i gp w fit/2 I AWAM Maw/k 3 Sheets-Sheet 3 Q 7 4. 3 I W 5 3 4 l Ila. v fmmw fl w vv M wwi r f 4 a 5 May 19, 1931 LEE S. CHADWICK, F SHAKER HEIGHTS, OHIO, ASSIGNOB T0 PERFECTION STOVE COIL Patented May 19, 1931 STATS UETE PANY, or CLEVELAND, OHIO, Aconronn'rron oronio Aria rUMr Eon. rn-n s'o'nn FUEL TANKS Application filed January 13, 1927. Serial No. 160,846. I

This invention relates to improvements in the class of liquid fuel stoves wherein the fuel is fed by air pressure, and it has to do more v particularly with unique features pertainingto the pump by means of which air under pressure is injected into the fueltank. In the present instance- I have shown the invention associated with a stove of the same type as those disclosed in applications Serial Nos.

126,366 and I 149,353, filed jointly by Marc Resek and myself on August 2, 1926 and November 19, 1926, respectively-and in an application bearing Serial No. 152,356, filed by said Marc Resek on December 3, 1926.

In stoves of the type referred to the pumps by which air pressure is created in the fuel tanks are separate from the stoves and have to be held with one hand, with thei-rdischarge openings or nozzles pressed firmly against the seats designed to receive them, while being operated with the other hand. .The frame structures ofvstoves of the class in question are usually built principally or entirely of sheet metal and therefore are relatively light and yield more or less to. any force, and be cause of this it is especially difficult to main-' tain a fluid tight connection between the outlet of the pump and the seat surrounding the air inlet of the stove while operating the Furthermore, manually operated valves, in addition to check valves, are employed for positively closing the air passageways of the s. tanks wherewith the pumps are adapted to be connected thereby to effectively prevent leakage of air after the operation of the pumps has been stopped and the pumps removed.

The objects of my invention areto provide. means for supporting and properlypositiontioned inoperative relation to the stove and which is adapted tobe manipulated through the intervention of the pump 5 and, more generally, to provide a simple, relatively ineX-' pensive, substantial and durable construction through which the previously mentioned obj ects are attained.

An embodiment of the invention is illustrated in the accompanying drawings wherein Fig. 1 is a fragmentary sectional front elevation of a stove incorporating my improvements; Fig. 2 is a partial end elevation of the stove; F ig. 3 is an enlarged sectional detail through the connections between the pump and the fuel tank; Fig. 4 is a sectional detail on a further enlarged scale through the scparable connection between'the pump and the air inlet of the stove, and Fig. 5 is a section.

on the line 5-5 of Fig. 4. j

V Thestove structure involves a top 1, an end panel 2 and a burner pan 3-, the latter being connected to'theend panel a suitable-distance below and parallelwiththe'top 1; The top 1 is provided with the usual burner openings, one of which is shown at 4 above a burner 5 (Fig. 1). A part or 'unit 6 is escured to and projects laterally from the end panel 2 in about the plane of the burner pan I 3 and at its outer end is formed witha dependingboss 7 that is surrounded by a depressed seat 8 to which a washer 9 of suitable packing material is applied. The boss 7 l is tank 11". Encirclingthe neck 10 is a'band .12 having opposed trunnions 13 on which are pivoted the opposite ends of a bail 14. A screw 15 is threaded through the central portion of the'bail and bears at its endwithin a depression that is formed in theupper side i of the'unit6, and by the manipulation of the screw 15 the tank is adapted to be drawn up designed to fit within the neck 10,[of the fuel 1 with. its neck firmly engaged against the:

washer 9 therebyito effect a fluid tight connection between the tank and the unit 6. The screw 15"is equipped with a large head 16 that provides a comfortable hand grip for operating the screw and for carrying the tank when the latter is removed from the stove which obviously is effected by the retraction of the, screw and the at the bail. .4; from g of its barrel, it may be of usual form.

[is inserted into the socket over the end of the unit 6 and allowing the tank to drop thereby to Withdraw its neck from the boss 7.

While this feature comprises no part of my present invention I may explain briefly that a passageway is formed in the unit 6 and'communicates at one end with a tube 21 that is inserted upwardly into a counterbore of the passageway 20 and extends to near the bottom of the tank. The opposite end of the passageway 20 connects with a c0nduit 22 that incorporates a valve 23 and leads to a retort or generator 24 that is removably secured to the conduit through means of a clamp 25. This removable retort constitutes the subject matter of a co-pending application of Marc Resek and myself. Serial No. 152,798, filed December 6, 1926. As may be seen by reference to said application the retort 24 discharges into a mixer which forms a part of a conduit leading to the burner 5.

The unit 6 incorporates a forwardlyprojecti-ng arm 28, and a duct 29 leads through this arm and the adjacent body portion of the unit and downwardly through the boss 7, as shown in Fig. 3, for communication with the interior of the tank above the maximum liquid fuel level therein. The outer end of the duct opens into an enlargement 30 into which is shrunk, brazed-or otherwise secured the reduced lower end of a fitting 31 whose upper end is enlarged and formed with a cavity 32. The fitting 31 has a central bore or passageway that is threaded at its upper end for the reception of a screw valve 33 whose lower end is designed for cooperation with a seat providedon the upper side of a restriction 34 that is formed about the bore of the fitting intermediate its ends. The opposite side of the restriction is tapered to form a seat for a ball check valve 35 that is retained within the lower portion of the bore by lugs 36. The screw valve 33 is provided with a here or passageway 37 that opens at its lower end through a port 38 into the bore of the fitting 31 above the restriction 34; and at its upper end the passageway 37 is flared to provide a tapered seat 40 for the rounded end of the outlet extension or nozzle 41 of an air pump 42. I This air pump is of common construc tion and principle and, excepting for the fact that its air outlet or nozzle 41 is formed with a hexagonal portion 43,-and a clrcumferential groove 44 extends about the lower end A flange 45 surrounds the upper end of the screw valve 33, and rising from this ,fiange about the seat 40 is a socket member 46 that is made of a size and shape to receive with a proper the hexagonal portion 43 of the pump nozzle 41. v

It will be seen from the construction just described that when the nozzle of the pump 46 so as to engage the terminal-of the nozzle with the seat '40 a driving connection is effected between the pump and the screw valve 33 which will enable the valve to be manipulated by simply turning the barrel of the pump. The screw valve is prevented from withdrawal from the bore of the fitting 31 by the engagement of the flange 45 with a stop ring 48 that is set within the top of the cavity 32 and secured to the surrounding wall of the fitting by brazing or other means.

The pro-per angular relation between the pump and the fitting 31 is effected by means of a guide and support for the upper end of the pump barrel and in the present instance this is in the form of a sleeve 50 incorporated in a bracket 51 whose base 52 is secured by rivets or other fastening means 53, 54 and 55 to the end panel 2. The fastening means 55 is shown as being the same as that which secures the upper end of the fuel conduit 22 to the end panel. The bracket 51 is preferably formed from a single piece of strap metal.

The pump 42 is adapted to be maintained with its nozzle in substantially air tight contact with the seat 40 of the fitting 31 by a spring latch 56 that is shown in the present instance as being constructed from a piece of strap metal. The strap is inserted through a slot .57 in the end panel 2 and is carried up adjacent the inner side of the panel to where its upper end is .secured to the panel by the previously mentioned fastening means 54. Thelower end of the latch 56 is formed to lit the circumferential groove 44 of the pump barrel, and when the pump is projected downwardly through the sleeve 50 and its nozzle inserted into the socket 46, the groove 44 is presented inoperative relation to the latch and the latch automatically springs into the groove and holds the pump against retraction. The pump is of the cylinder and piston reciprocating type and a knob or handle 58 by means of which the pump is operated is carried directly by the upper end of the piston rod 59. 7

To remove the pump from the stove it is only necessary to spring the latch 56 away from the pump barrel thereby to disengage its lower end from the groove 44 and withdraw the pump barrel from the sleeve 50; and to facilitate the disengagement of the latch from the pump a finger piece 60 is applied to the rear side of the latch and formedintegral with the finger piece is a stop 61 which is arranged to engage the panel 2 and thus preventundue movement and a possible consequential permanent distortion of the latch.

While the manner of using the invention is evident from the foregoing "description, I may explain, briefly, that when it is desired to inject air under pressure into the tank 11 the pump is inserted through the sleeve 50 and its nozzle is engaged Within the socket 46 and pressed down until the terminal of the nozzle contacts with the seat 40 whereupon the latch 56 willspring into the groove .44 and hold the pump in such position. The pump barrel is then rotated'to retract the screw valve 33 from its seat and this slight elevation of the valve will enhance the fluid tight connection between the pump nozzle and the seat l0, and the holding engagement of the latch with the shoulder provided by the lower side of the groove 44;. The pump is then operated, and when the desired pressure is obtained, as will be indicated by an air gauge 65 that communicates with the interior of the tank in a manner substantially identi-v cal with the communicationestablished between the pump and the tank, the screw valve 33 may be lowered to its seat by a reverse rotation of the pump barrel and the air pressure will thus be positively held. The ball check valve 35 functions. to prevent escape of air during receding strokes of the pump piston.

For claim purposes, the tank 11 may be considered a receiver;

Having thus described by invention, what I claim is 1. In combination with a receiver, an air pump, a ported part to which said pump is adapted to be applied for transmitting air from the pump to the receiver, a rotatable valve controlling the passage of air through the port of said part, means supporting the pump for rotation with its discharge opening in communication with said port, and

further means releasably holding the pump in such position and in such manner as to permit of its being rotated, the pump and said valve having cooperating parts through which a driving connection is effected obetween the pump and valve whereby the valve is adapted to be rotated through the instrumentality of the pump. v 1

2. In combination with a receiver, an air pump comprising a cylindrical barrel, said barrel having a circumferential shoulder, a ported part to which said pump is adapted to be applied for transmitting air from the pump to the receiver, avrotatable valve con; trolling the passage of air through the port of said part, means embracing the barrelof the pump for rotatably supporting the pump with its discharge opening in communication with said part, and a latch engaging the aforesaid shoulder for releasably holding the pump in such position, the pump and said valve having cooperating parts through which a driving connection is effected between the pump and the valve whereby the valve is adapted to be rotated through the instrumentality of the pump. I

.3. In combination with a receiver, an air pump comprising-a. cylindrical barrel that.

is provided with a circumferential groove, a ported part to which said pump is adapted to be applied for transmitting air from the pump to the receiver, a rotatable valve controlling the passage of air through the port of said part, a supporting member incorporting a guide through which the pump -bar= rel is adapted to be extended and by which said barrel is encircled, said guide serving to 'sup-portfthe pump with its discharge opening in communlcation with said port, a latch having a part engaging within the aforesaid circumferential groove for'releasably holding the pump in such position',the pump and said valve having cooperating parts effecting a driving connection between the pump and valve whereby the valve is adapted tobe rotated through pump.

theinstrumentality of the j 4. In combination'with a receiver, an air pump comprising a cylindrical barrel having a circumferential groove, a ported part to.

which said, pump is adapted to be applied for transmitting air from the pump. to the receiver, a rotatable valve controlling the passage of air through the port of said part, a

member incorporating a guide sleeve through Y which the barrel of the pump is adapted to be projected and servingto support the pump with its discharge opening incommunication with said port, a spring latch arranged to engage the circumferential groove of the be applied for transmitting air from the 7 pump to the receiver, a rotatable valve con trolling the passage of air through the port of said part, a bracket applied to the panel and involving a sleev e' through which the barrel of the pump is adapted to be projected and servingtosupport'the pump with its discharge opening in communication with the aforesaid port, a spring latch having a part. disposed on the side ofthe panel'- remote from said bracket, the panel having an opening through which a part of said latch extends for engagement with the circumferential groove of the pump-barrel, the pump and said valve havingcooperating parts effecting a driving connection betweenthe pump and valve whereby the valve is adapted to be ro- :tated through the instrumentality of the pump. M f

I 6. In combination with a structure involving'a panel and a receiver, an air pump comprising a cylindrical barrel having a circumferential groove adjacent its dischargeend,

a ported part to whichthe pump 'is' adapted to be'applied. fortransmitting air from the pump to the receiver, a rotatable valve controlling the passage of air through the port of said part, a bracket applied to the panel and involving a sleeve through which the barrel of the pump is adapted to be projected and serving to support the pump with its discharge opening in communication with the aforesaid port, a spring latch carried by the panel and having a part for engagement with the circumferential groove of the pump barrel, a member secured to said spring latch and involving a finger piece and a stop for engagement with the panel thereby to limit the swinging movement of the spring latch, the pump and said valve having cooperating parts, effecting a driving connection between the pump and valve whereby the valve is adapted to be rotated through the instrumentality of the pump.

7. In combination with a receiver, an air pump comprising a barrel, said barrel having a shoulder, a ported part to which said pump is adapted to be applied for transmitting air from the pump to the receiver, means embracing the barrel of the pump for supporting the pump with its discharge opening in communication withthe port of said part, and a latch engaging the aforesaid shoulder for releasably holding the pump in such position.

8. In combination with a receiver, an air pump having a circumferential shoulder, a ported screw through which air is adapted to be transmitted from the pump to the receiver, a part of the pump surrounding its discharge opening being adapted to be pressed against a part of said screw surrounding the port thereof whereby communication is established between the outlet of the pump and said port, the pump and said screw having cooperating portions through which a driving connection is effected between the pump and screw whereby the screw is adapted to be turned through the instrumentality of the pump,-and means engaging the aforesaid shoulder of the pump pump, a ported part to which said pump is intended to be temporarily applied for transmitting air from the pump to the receiver, holding means for supporting the pump in position with its discharge opening in communication with the port of said part, and a latch for detachably securing the pump in said position.

11. In combination with a receiver, an air pump, a ported-partto which said pump is adapted to be applied for transmitting air from the pump to the receiver, a valve controlling the passage of air through the ported part, the pump and said valve having c0- operating parts whereby the valve is adapted to be manipulated through the instrumentality of the pump, and holding means for removablysupporting the pump with its discharge opening in communication with said port.

In testimony whereof, I hereunto aflix my signature.

LEE S. CHADWICK.

to prevent retraction of the pump when the same is turned in a direction to retract the screw.

9. In'combination witha receiver, an air pump,a ported screw valve through which air is adapted to be transmitted from the pump to the receiver, a part of the pump surrounding its discharge opening being adapted to be pressed against a part of'said screw valve surrounding the port thereof whereby communication is established between the outlet of the pump and said port, the pump and said screw valve having cooperating portions through which a driving connection is effected between the pump and valve whereby the latter is adapted to be turned through the instrumentality of the pump, and means pre-' venting the retraction of the pump when the pump is turned in a direction to retract and open the screw valve.

10. In, combination with areceiver, an air 

